Yimaia is an extinct genus of Ginkgoalean tree, and the only member of the family Yimaiaceae.

In botanical form classification, its a form taxon for ginkgoalean ovulate organs.

Yimaia species are distinguished from other Ginkgoales by the presence of "Ovulate organs consisting of a peduncle and up to eight or nine terminal, sessile, contiguous and orthotropous (straight, upright and with a micropyle at apex) ovules."

The ovules are associated with leaves of either Baiera or Ginkgoites leaf morphospecies.

[1] Fossils have been found in Middle Jurassic deposits in China.